Extension on "Display link"
When we upload a image from an URL, and if there are some parameters at the end of the URL (like ?resize=300%2C169), the "Display Link" in Lutim will also have this parameter. As I understand, the text after the . in the display URL is optional (as I can see my image if I remove the text after the . in my Lutim instance)
It may be better to remove the extension, or rebuild a new one according to the MIME type, to avoid unwanted text (which can also leak some informations about source)